UG-361 Datasheet, PDF (3/8 Pages) Analog Devices – High Speed Evaluation Board for Full Duplex M-LVDS Transceivers

Evaluation Board User Guide
UG-361
EVALUATION BOARD CONFIGURATION
SETTING UP THE EVALUATION BOARD
The EVAL-ADN469xEFDEBZ allows the full-duplex parts in
the ADN469xE family to be quickly and easily evaluated. The
evaluation board allows all of the input and output functions to
be exercised without the need for external components. Jumper
configurations are shown in Table 2.
The board is powered by connecting a 3.3 V power supply to the
screw terminals for VCC and GND. Supply current is typically
16 mA with both driver and receiver enabled or 1 mA with
both disabled. A 10 μF decoupling capacitor, C1, is fitted at
the connector between VCC and GND. The VCC pin of the
ADN469xE is fitted with a decoupling capacitor of 100 nF.
An example evaluation of the ADN4692E/ADN4693E/
ADN4695E/ADN4697E driver is shown in Figure 2. A signal
generator is connected to DI with an input signal of 50 MHz
(ADN4692E/ADN4695E) or 100 MHz (ADN4693E/ADN4697E),
with a 50% duty cycle and swing of between 0 V and 3.3 V.
Jumpers LK1 and LK2 are connected in Position A to disable
the receiver and enable the driver. Oscilloscope probes are
connected to DI, Y, and Z.
Similarly, an evaluation of the ADN4692E/ADN4693E/
ADN4695E/ADN4697E receiver is shown in Figure 3. A
signal generator capable of applying a differential input signal
is connected to J5 and J6, with the input swing between 1 V and
SIGNAL
GENERATOR
3.3V POWER
SUPPLY
1.2 V (J6 input is the inverse of J5). Jumpers LK1 and LK2 are
connected in Position B to enable the receiver and disable the
driver. Oscilloscope probes are attached to RO, A, and B.
EVALUATION WITH APPLICATIONS
Two EVAL-ADN469xEFDEBZ boards can connect together in a
point-to-point configuration, as shown in Figure 4. To allow part
evaluation with a load equivalent to a parallel-terminated bus,
the boards have been fitted with 50 Ω termination resistors. For
the point-to-point configuration in Figure 4, replace these resistors
with 100 Ω resistors.
A signal generator is connected onto the DI input of one board.
The Y and Z outputs of this board are connected to the A and B
inputs of the second board, respectively.
Connecting probes to DI on the first board, and A, B, and RO
on the second, the propagation of the input signal across the
bus and to the receiver output of the second board can be
observed and evaluated.
Alternatively, the EVAL-ADN469xEFDEBZ can connect to an
existing bus and a control board, as shown in Figure 5, to test
the performance in the application. In this case, remove both
termination resistors, as well as the jumpers on LK1 and LK2.
Connect control signals to RO, RE, DE, and DI.
EVAL-ADN469xEFDEBZ
J9
RE
RO GND VCC ^GND
J2
J1
DE ^{LK1 RO}
J5
A
J3
AB
DI
RE
DE
GND
J6
B
J4 LK2 DI GND
Y Z GND
GND ^J8
J7
OSCILLOSCOPE
Figure 2. ADN4692E/ADN4693E/ADN4695E/ADN4697E Driver Evaluation with EVAL-ADN469xEFDEBZ
3.3V POWER
SUPPLY
SIGNAL
GENERATOR
EVAL-ADN469xEFDEBZ
J9
RE
RO GND VCC ^GND
J2
J1
DE ^{LK1 RO}
J5
A
J3
AB
DI
RE
DE
GND
J6
B
J4 LK2 DI GND
Y Z GND
GND ^J8
J7
OSCILLOSCOPE
Figure 3. ADN4692E/ADN4693E/ADN4695E/ADN4697E Receiver Evaluation with EVAL-ADN469xEFDEBZ
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